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          每天进步一点点023 - Flutter项目源码阅读笔记
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        <h1 id="Preface"><a href="#Preface" class="headerlink" title="Preface"></a>Preface</h1><p>最近打算开发一些app，做长期的打算。<br>但是做某些方面还是有些不解，所以看一下别人开源的比较成熟的代码来学习。</p>
<h1 id="Content"><a href="#Content" class="headerlink" title="Content"></a>Content</h1><h2 id="runZonedGuarded"><a href="#runZonedGuarded" class="headerlink" title="runZonedGuarded"></a>runZonedGuarded</h2><p>来自<code>dart:async</code></p>
<figure class="highlight dart"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Since</span>(<span class="string">&quot;2.8&quot;</span>)</span><br><span class="line">R? runZonedGuarded&lt;R&gt;(</span><br><span class="line">    R body(),</span><br><span class="line">    <span class="keyword">void</span> onError(</span><br><span class="line">        <span class="built_in">Object</span> error,</span><br><span class="line">        StackTrace stack</span><br><span class="line">    ),</span><br><span class="line">    &#123;<span class="built_in">Map</span>&lt;<span class="built_in">Object?</span>, <span class="built_in">Object?</span>&gt;? zoneValues,</span><br><span class="line">    ZoneSpecification? zoneSpecification&#125;</span><br><span class="line">)</span><br></pre></td></tr></table></figure>
<p>在body本身的Zone范围内运行。  </p>
<h3 id="参考"><a href="#参考" class="headerlink" title="参考"></a>参考</h3><ul>
<li><a target="_blank" rel="external nofollow noopener noreferrer" href="https://api.flutter.dev/flutter/dart-async/runZonedGuarded.html">dart-async/runZonedGuarded.html</a></li>
<li><a target="_blank" rel="external nofollow noopener noreferrer" href="https://api.flutter.dev/flutter/dart-async/Zone-class.html">Zone</a></li>
</ul>
<h2 id="sentry-flutter"><a href="#sentry-flutter" class="headerlink" title="sentry_flutter"></a>sentry_flutter</h2><p>flutter哨兵。用于激活自动报告错误，消息以及异常。  </p>
<h3 id="主要功能"><a href="#主要功能" class="headerlink" title="主要功能"></a>主要功能</h3><ul>
<li>自动追踪本地崩溃错误</li>
<li>离线存储事件</li>
<li>利用设备数据</li>
<li>等等</li>
</ul>
<h3 id="使用"><a href="#使用" class="headerlink" title="使用"></a>使用</h3><ul>
<li>注册Sentry.io账号，然后在 <em><a target="_blank" rel="external nofollow noopener noreferrer" href="http://sentry.io">http://sentry.io</a></em> 上获取一个DNS</li>
<li>安装此插件</li>
<li>利用上面获得的DNS初始化Sentry SDK<figure class="highlight dart"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 普通初始化</span></span><br><span class="line">Future&lt;<span class="keyword">void</span>&gt; main() <span class="keyword">async</span> &#123;</span><br><span class="line">  <span class="keyword">await</span> SentryFlutter.init(</span><br><span class="line">    (options) &#123;</span><br><span class="line">      options.dsn = <span class="string">&#x27;https://example@sentry.io/add-your-dsn-here&#x27;</span>;</span><br><span class="line">    &#125;,</span><br><span class="line">    <span class="comment">// Init your App.</span></span><br><span class="line">    appRunner: () =&gt; runApp(MyApp()),</span><br><span class="line">  );</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">// 在自己的错误空间内初始化</span></span><br><span class="line">Future&lt;<span class="keyword">void</span>&gt; main() <span class="keyword">async</span> &#123;</span><br><span class="line">  runZonedGuarded(() <span class="keyword">async</span> &#123;</span><br><span class="line">    <span class="keyword">await</span> SentryFlutter.init(</span><br><span class="line">      (options) &#123;</span><br><span class="line">        options.dsn = <span class="string">&#x27;https://example@sentry.io/add-your-dsn-here&#x27;</span>;</span><br><span class="line">      &#125;,</span><br><span class="line">    );</span><br><span class="line"></span><br><span class="line">    runApp(MyApp());</span><br><span class="line">  &#125;, (exception, stackTrace) <span class="keyword">async</span> &#123;</span><br><span class="line">    <span class="keyword">await</span> Sentry.captureException(exception, stackTrace: stackTrace);</span><br><span class="line">  &#125;);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
还有更多的功能，需要详细阅读插件相关api等。  </li>
</ul>
<h3 id="参考-1"><a href="#参考-1" class="headerlink" title="参考"></a>参考</h3><ul>
<li><a target="_blank" rel="external nofollow noopener noreferrer" href="https://docs.sentry.io/platforms/flutter/">sentry.io</a></li>
<li><a target="_blank" rel="external nofollow noopener noreferrer" href="https://pub.dev/documentation/sentry_flutter/latest/">api/init</a></li>
</ul>
<h2 id="get-dart"><a href="#get-dart" class="headerlink" title="get.dart"></a>get.dart</h2><h3 id="介绍"><a href="#介绍" class="headerlink" title="介绍"></a>介绍</h3><p>融合了高性能的状态管理，智能依赖注入，快速实用的路由管理。</p>
<h3 id="使用-1"><a href="#使用-1" class="headerlink" title="使用"></a>使用</h3><h4 id="1-用GetMaterialApp代替MaterialApp"><a href="#1-用GetMaterialApp代替MaterialApp" class="headerlink" title="1.用GetMaterialApp代替MaterialApp"></a>1.用GetMaterialApp代替MaterialApp</h4><figure class="highlight dart"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">void</span> main() =&gt; runApp(GetMaterialApp(home: Home()</span><br></pre></td></tr></table></figure>
<h4 id="2-制作业务逻辑类，使用-【-obs】-将变量变为可观察的"><a href="#2-制作业务逻辑类，使用-【-obs】-将变量变为可观察的" class="headerlink" title="2. 制作业务逻辑类，使用 【.obs】 将变量变为可观察的"></a>2. 制作业务逻辑类，使用 【.obs】 将变量变为可观察的</h4><figure class="highlight dart"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Controller</span> <span class="keyword">extends</span> <span class="title">GetxController</span></span>&#123;</span><br><span class="line">  <span class="keyword">var</span> count = <span class="number">0.</span>obs;</span><br><span class="line">  increment() =&gt; count++;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h4 id="3-使用StatelessWidget制作自定义视图可以节约一些内存"><a href="#3-使用StatelessWidget制作自定义视图可以节约一些内存" class="headerlink" title="3. 使用StatelessWidget制作自定义视图可以节约一些内存"></a>3. 使用StatelessWidget制作自定义视图可以节约一些内存</h4><p>有了Get之后，就不需要StatefulWidget了</p>
<figure class="highlight dart"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Home</span> <span class="keyword">extends</span> <span class="title">StatelessWidget</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@override</span></span><br><span class="line">  Widget build(context) &#123;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 通过 Get.put() 实例化你的逻辑类，这样他在所有的儿子节点中都可用</span></span><br><span class="line">    <span class="keyword">final</span> Controller c = Get.put(Controller());</span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span> Scaffold(</span><br><span class="line">      <span class="comment">// 通过 Obx(()=&gt; 在每次count更新的时候刷新 Text() </span></span><br><span class="line">      appBar: AppBar(title: Obx(() =&gt; Text(<span class="string">&quot;Clicks: <span class="subst">$&#123;c.count&#125;</span>&quot;</span>))),</span><br><span class="line"></span><br><span class="line">      <span class="comment">// 用一句简单的 Get.to() 替换8 行Navigator.push</span></span><br><span class="line">      body: Center(child: ElevatedButton(</span><br><span class="line">              child: Text(<span class="string">&quot;Go to Other&quot;</span>), onPressed: () =&gt; Get.to(Other()))),</span><br><span class="line">      floatingActionButton:</span><br><span class="line">          FloatingActionButton(child: Icon(Icons.add), onPressed: c.increment));</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Other</span> <span class="keyword">extends</span> <span class="title">StatelessWidget</span> </span>&#123;</span><br><span class="line">  <span class="comment">// 在子节点中通过 Get 找到 Controller 实例</span></span><br><span class="line">  <span class="keyword">final</span> Controller c = Get.find();</span><br><span class="line"></span><br><span class="line">  <span class="meta">@override</span></span><br><span class="line">  Widget build(context)&#123;</span><br><span class="line">     <span class="comment">// 访问到他的变量</span></span><br><span class="line">     <span class="keyword">return</span> Scaffold(body: Center(child: Text(<span class="string">&quot;<span class="subst">$&#123;c.count&#125;</span>&quot;</span>)));</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="国际化"><a href="#国际化" class="headerlink" title="国际化"></a>国际化</h3><p>继承<strong>Translations</strong>，添加字典：</p>
<figure class="highlight dart"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> <span class="string">&#x27;package:get/get.dart&#x27;</span>;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Messages</span> <span class="keyword">extends</span> <span class="title">Translations</span> </span>&#123;</span><br><span class="line">  <span class="meta">@override</span></span><br><span class="line">  <span class="built_in">Map</span>&lt;<span class="built_in">String</span>, <span class="built_in">Map</span>&lt;<span class="built_in">String</span>, <span class="built_in">String</span>&gt;&gt; <span class="keyword">get</span> keys =&gt; &#123;</span><br><span class="line">        <span class="string">&#x27;en_US&#x27;</span>: &#123;</span><br><span class="line">          <span class="string">&#x27;hello&#x27;</span>: <span class="string">&#x27;Hello World&#x27;</span>,</span><br><span class="line">        &#125;,</span><br><span class="line">        <span class="string">&#x27;de_DE&#x27;</span>: &#123;</span><br><span class="line">          <span class="string">&#x27;hello&#x27;</span>: <span class="string">&#x27;Hallo Welt&#x27;</span>,</span><br><span class="line">        &#125;</span><br><span class="line">      &#125;;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>使用也很简单：</p>
<figure class="highlight dart"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//加上.tr后缀就可以了</span></span><br><span class="line">Text(<span class="string">&#x27;title&#x27;</span>.tr);</span><br></pre></td></tr></table></figure>

<figure class="highlight dart"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//区域定位</span></span><br><span class="line"><span class="keyword">return</span> GetMaterialApp(</span><br><span class="line">    translations: Messages(), <span class="comment">// your translations</span></span><br><span class="line">    locale: Locale(<span class="string">&#x27;en&#x27;</span>, <span class="string">&#x27;US&#x27;</span>), <span class="comment">// translations will be displayed in that locale</span></span><br><span class="line">    fallbackLocale: Locale(<span class="string">&#x27;en&#x27;</span>, <span class="string">&#x27;UK&#x27;</span>), <span class="comment">// specify the fallback locale in case an invalid locale is selected.</span></span><br><span class="line">);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 更换区域</span></span><br><span class="line"><span class="keyword">var</span> locale = Locale(<span class="string">&#x27;en&#x27;</span>, <span class="string">&#x27;US&#x27;</span>);</span><br><span class="line">Get.updateLocale(locale);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 系统区域</span></span><br><span class="line"><span class="keyword">return</span> GetMaterialApp(</span><br><span class="line">    locale: Get.deviceLocale,</span><br><span class="line">);</span><br></pre></td></tr></table></figure>
<p>依赖注入主要是通过 <strong>Get.Put</strong> 和 <strong>Get.lazyPut</strong> 实现。<br>其实这个所谓的依赖就是自定义的业务逻辑类。<br>还有更多封装好的功能，非常强大，需要区阅读文档。</p>
<h3 id="参考-2"><a href="#参考-2" class="headerlink" title="参考"></a>参考</h3><ul>
<li><a target="_blank" rel="external nofollow noopener noreferrer" href="https://pub.flutter-io.cn/packages/get">packages/get</a></li>
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